3–14 Site Preparation and Maintenance
3.5.2 10BaseT Ethernet Connection
The 10BaseT Ethernet installation must conform to the following configuration
rules:
• The twisted-pair cable must not exceed the maximum distance listed in
Table 3-3.
• No other signal should be used in the same cable sheath. For example, voice
and data signals cannot be run within the same sheath.
• Unshielded twisted-pair cable must remain at least 30.48 cm (12 in) from any
type of high-voltage power device or electrical noise source.
3.5.3 ThinWire Ethernet Connection
The ThinWire cable segment must conform to the following configuration rules:
• The maximum cable segment length must not exceed 185 m (606 ft).
• There must be a 50-ohm terminator at each end of the cable segment, unless
the cable ends in a DEMPR or DESPR. Both these devices have built in
50-ohm terminators.
• There must be only one ground per cable segment.
• There must be at least 0.5 m (19 in) between T-connectors.
• The maximum number of stations, between terminators, must not exceed 30
stations.
• ThinWire cable segments must not be configured in a loop.
• ThinWire cable segments must not have any branch segments.
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